Clement Lang Hirsch (April 26, 1914 – March 15, 2000) was an American businessman and a prominent Thoroughbred racehorse owner who co-founded Oak Tree Racing Association. Born in St. Louis, Missouri to a very successful family of retail merchants, Clement Hirsch moved to California as a young man. During World War II he served with the United States Marine Corps and was part of the Guadalcanal Campaign. In 1963 Clement Hirsch and his second wife Edith Mack Hirsch were divorced. She remarried to actor Desi Arnaz. Married four times, Clement Hirsch had six children from his marriages.